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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a Scsi_Device is allocated and setup for it.
13 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
20 * Scsi_Device for it.
21 *
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
26 */
27
28#include <linux/config.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/init.h>
32#include <linux/blkdev.h>
33#include <asm/semaphore.h>
34
35#include <scsi/scsi.h>
36#include <scsi/scsi_device.h>
37#include <scsi/scsi_driver.h>
38#include <scsi/scsi_devinfo.h>
39#include <scsi/scsi_host.h>
40#include <scsi/scsi_request.h>
41#include <scsi/scsi_transport.h>
42#include <scsi/scsi_eh.h>
43
44#include "scsi_priv.h"
45#include "scsi_logging.h"
46
47#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
48 " SCSI scanning, some SCSI devices might not be configured\n"
49
50/*
51 * Default timeout
52 */
53#define SCSI_TIMEOUT (2*HZ)
54
55/*
56 * Prefix values for the SCSI id's (stored in driverfs name field)
57 */
58#define SCSI_UID_SER_NUM 'S'
59#define SCSI_UID_UNKNOWN 'Z'
60
61/*
62 * Return values of some of the scanning functions.
63 *
64 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
65 * includes allocation or general failures preventing IO from being sent.
66 *
67 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
68 * on the given LUN.
69 *
70 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
71 * given LUN.
72 */
73#define SCSI_SCAN_NO_RESPONSE 0
74#define SCSI_SCAN_TARGET_PRESENT 1
75#define SCSI_SCAN_LUN_PRESENT 2
76
77static char *scsi_null_device_strs = "nullnullnullnull";
78
79#define MAX_SCSI_LUNS 512
80
81#ifdef CONFIG_SCSI_MULTI_LUN
82static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
83#else
84static unsigned int max_scsi_luns = 1;
85#endif
86
87module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
88MODULE_PARM_DESC(max_luns,
89 "last scsi LUN (should be between 1 and 2^32-1)");
90
91/*
92 * max_scsi_report_luns: the maximum number of LUNS that will be
93 * returned from the REPORT LUNS command. 8 times this value must
94 * be allocated. In theory this could be up to an 8 byte value, but
95 * in practice, the maximum number of LUNs suppored by any device
96 * is about 16k.
97 */
98static unsigned int max_scsi_report_luns = 511;
99
100module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
101MODULE_PARM_DESC(max_report_luns,
102 "REPORT LUNS maximum number of LUNS received (should be"
103 " between 1 and 16384)");
104
105static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
106
107module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
108MODULE_PARM_DESC(inq_timeout,
109 "Timeout (in seconds) waiting for devices to answer INQUIRY."
110 " Default is 5. Some non-compliant devices need more.");
111
112/**
113 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500114 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * @result: area to store the result of the MODE SENSE
116 *
117 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 * Called for BLIST_KEY devices.
120 **/
James Bottomley39216032005-06-15 18:48:29 -0500121static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 unsigned char *result)
123{
124 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
125
126 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
127 scsi_cmd[0] = MODE_SENSE;
128 scsi_cmd[1] = 0;
129 scsi_cmd[2] = 0x2e;
130 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500131 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500133 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
134 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
137/**
138 * print_inquiry - printk the inquiry information
139 * @inq_result: printk this SCSI INQUIRY
140 *
141 * Description:
142 * printk the vendor, model, and other information found in the
143 * INQUIRY data in @inq_result.
144 *
145 * Notes:
146 * Remove this, and replace with a hotplug event that logs any
147 * relevant information.
148 **/
149static void print_inquiry(unsigned char *inq_result)
150{
151 int i;
152
153 printk(KERN_NOTICE " Vendor: ");
154 for (i = 8; i < 16; i++)
155 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
156 printk("%c", inq_result[i]);
157 else
158 printk(" ");
159
160 printk(" Model: ");
161 for (i = 16; i < 32; i++)
162 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
163 printk("%c", inq_result[i]);
164 else
165 printk(" ");
166
167 printk(" Rev: ");
168 for (i = 32; i < 36; i++)
169 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
170 printk("%c", inq_result[i]);
171 else
172 printk(" ");
173
174 printk("\n");
175
176 i = inq_result[0] & 0x1f;
177
178 printk(KERN_NOTICE " Type: %s ",
179 i <
180 MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
181 "Unknown ");
182 printk(" ANSI SCSI revision: %02x",
183 inq_result[2] & 0x07);
184 if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1)
185 printk(" CCS\n");
186 else
187 printk("\n");
188}
189
190/**
191 * scsi_alloc_sdev - allocate and setup a scsi_Device
192 *
193 * Description:
194 * Allocate, initialize for io, and return a pointer to a scsi_Device.
195 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
196 * adds scsi_Device to the appropriate list.
197 *
198 * Return value:
199 * scsi_Device pointer, or NULL on failure.
200 **/
201static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
202 unsigned int lun, void *hostdata)
203{
204 struct scsi_device *sdev;
205 int display_failure_msg = 1, ret;
206 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
207
208 sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size,
209 GFP_ATOMIC);
210 if (!sdev)
211 goto out;
212
213 memset(sdev, 0, sizeof(*sdev));
214 sdev->vendor = scsi_null_device_strs;
215 sdev->model = scsi_null_device_strs;
216 sdev->rev = scsi_null_device_strs;
217 sdev->host = shost;
218 sdev->id = starget->id;
219 sdev->lun = lun;
220 sdev->channel = starget->channel;
221 sdev->sdev_state = SDEV_CREATED;
222 INIT_LIST_HEAD(&sdev->siblings);
223 INIT_LIST_HEAD(&sdev->same_target_siblings);
224 INIT_LIST_HEAD(&sdev->cmd_list);
225 INIT_LIST_HEAD(&sdev->starved_entry);
226 spin_lock_init(&sdev->list_lock);
227
228 sdev->sdev_gendev.parent = get_device(&starget->dev);
229 sdev->sdev_target = starget;
230
231 /* usually NULL and set by ->slave_alloc instead */
232 sdev->hostdata = hostdata;
233
234 /* if the device needs this changing, it may do so in the
235 * slave_configure function */
236 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
237
238 /*
239 * Some low level driver could use device->type
240 */
241 sdev->type = -1;
242
243 /*
244 * Assume that the device will have handshaking problems,
245 * and then fix this field later if it turns out it
246 * doesn't
247 */
248 sdev->borken = 1;
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 sdev->request_queue = scsi_alloc_queue(sdev);
251 if (!sdev->request_queue) {
252 /* release fn is set up in scsi_sysfs_device_initialise, so
253 * have to free and put manually here */
254 put_device(&starget->dev);
255 goto out;
256 }
257
258 sdev->request_queue->queuedata = sdev;
259 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
260
261 scsi_sysfs_device_initialize(sdev);
262
263 if (shost->hostt->slave_alloc) {
264 ret = shost->hostt->slave_alloc(sdev);
265 if (ret) {
266 /*
267 * if LLDD reports slave not present, don't clutter
268 * console with alloc failure messages
269
270
271 */
272 if (ret == -ENXIO)
273 display_failure_msg = 0;
274 goto out_device_destroy;
275 }
276 }
277
278 return sdev;
279
280out_device_destroy:
281 transport_destroy_device(&sdev->sdev_gendev);
282 scsi_free_queue(sdev->request_queue);
283 put_device(&sdev->sdev_gendev);
284out:
285 if (display_failure_msg)
286 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
287 return NULL;
288}
289
290static void scsi_target_dev_release(struct device *dev)
291{
292 struct device *parent = dev->parent;
293 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500294 struct Scsi_Host *shost = dev_to_shost(parent);
295
296 if (shost->hostt->target_destroy)
297 shost->hostt->target_destroy(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 kfree(starget);
299 put_device(parent);
300}
301
302int scsi_is_target_device(const struct device *dev)
303{
304 return dev->release == scsi_target_dev_release;
305}
306EXPORT_SYMBOL(scsi_is_target_device);
307
308static struct scsi_target *__scsi_find_target(struct device *parent,
309 int channel, uint id)
310{
311 struct scsi_target *starget, *found_starget = NULL;
312 struct Scsi_Host *shost = dev_to_shost(parent);
313 /*
314 * Search for an existing target for this sdev.
315 */
316 list_for_each_entry(starget, &shost->__targets, siblings) {
317 if (starget->id == id &&
318 starget->channel == channel) {
319 found_starget = starget;
320 break;
321 }
322 }
323 if (found_starget)
324 get_device(&found_starget->dev);
325
326 return found_starget;
327}
328
329static struct scsi_target *scsi_alloc_target(struct device *parent,
330 int channel, uint id)
331{
332 struct Scsi_Host *shost = dev_to_shost(parent);
333 struct device *dev = NULL;
334 unsigned long flags;
335 const int size = sizeof(struct scsi_target)
336 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400337 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 struct scsi_target *found_target;
339
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400340 /*
341 * Obtain the real parent from the transport. The transport
342 * is allowed to fail (no error) if there is nothing at that
343 * target id.
344 */
345 if (shost->transportt->target_parent) {
346 spin_lock_irqsave(shost->host_lock, flags);
347 parent = shost->transportt->target_parent(shost, channel, id);
348 spin_unlock_irqrestore(shost->host_lock, flags);
349 if (!parent)
350 return NULL;
351 }
352
353 starget = kmalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (!starget) {
355 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
356 return NULL;
357 }
358 memset(starget, 0, size);
359 dev = &starget->dev;
360 device_initialize(dev);
361 starget->reap_ref = 1;
362 dev->parent = get_device(parent);
363 dev->release = scsi_target_dev_release;
364 sprintf(dev->bus_id, "target%d:%d:%d",
365 shost->host_no, channel, id);
366 starget->id = id;
367 starget->channel = channel;
368 INIT_LIST_HEAD(&starget->siblings);
369 INIT_LIST_HEAD(&starget->devices);
370 spin_lock_irqsave(shost->host_lock, flags);
371
372 found_target = __scsi_find_target(parent, channel, id);
373 if (found_target)
374 goto found;
375
376 list_add_tail(&starget->siblings, &shost->__targets);
377 spin_unlock_irqrestore(shost->host_lock, flags);
378 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500379 transport_setup_device(dev);
380 device_add(dev);
381 transport_add_device(dev);
382 if (shost->hostt->target_alloc) {
383 int error = shost->hostt->target_alloc(starget);
384
385 if(error) {
386 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
387 /* don't want scsi_target_reap to do the final
388 * put because it will be under the host lock */
389 get_device(dev);
390 scsi_target_reap(starget);
391 put_device(dev);
392 return NULL;
393 }
394 }
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 return starget;
397
398 found:
399 found_target->reap_ref++;
400 spin_unlock_irqrestore(shost->host_lock, flags);
401 put_device(parent);
402 kfree(starget);
403 return found_target;
404}
405
406/**
407 * scsi_target_reap - check to see if target is in use and destroy if not
408 *
409 * @starget: target to be checked
410 *
411 * This is used after removing a LUN or doing a last put of the target
412 * it checks atomically that nothing is using the target and removes
413 * it if so.
414 */
415void scsi_target_reap(struct scsi_target *starget)
416{
417 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
418 unsigned long flags;
419 spin_lock_irqsave(shost->host_lock, flags);
420
421 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
422 list_del_init(&starget->siblings);
423 spin_unlock_irqrestore(shost->host_lock, flags);
424 device_del(&starget->dev);
425 transport_unregister_device(&starget->dev);
426 put_device(&starget->dev);
427 return;
428 }
429 spin_unlock_irqrestore(shost->host_lock, flags);
430}
431
432/**
433 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500434 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500436 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 * @bflags: store any bflags found here
438 *
439 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500440 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 *
James Bottomley39216032005-06-15 18:48:29 -0500442 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
James Bottomley39216032005-06-15 18:48:29 -0500444 * are copied to the Scsi_Device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 **/
James Bottomley39216032005-06-15 18:48:29 -0500446static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result,
447 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
450 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
451 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500452 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 struct scsi_sense_hdr sshdr;
454
455 *bflags = 0;
456
457 /* Perform up to 3 passes. The first pass uses a conservative
458 * transfer length of 36 unless sdev->inquiry_len specifies a
459 * different value. */
460 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
461 try_inquiry_len = first_inquiry_len;
462 pass = 1;
463
464 next_pass:
465 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY pass %d "
466 "to host %d channel %d id %d lun %d, length %d\n",
467 pass, sdev->host->host_no, sdev->channel,
468 sdev->id, sdev->lun, try_inquiry_len));
469
470 /* Each pass gets up to three chances to ignore Unit Attention */
471 for (count = 0; count < 3; ++count) {
472 memset(scsi_cmd, 0, 6);
473 scsi_cmd[0] = INQUIRY;
474 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500477
478 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500479 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500480 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
483 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500484 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
James Bottomley39216032005-06-15 18:48:29 -0500486 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 /*
488 * not-ready to ready transition [asc/ascq=0x28/0x0]
489 * or power-on, reset [asc/ascq=0x29/0x0], continue.
490 * INQUIRY should not yield UNIT_ATTENTION
491 * but many buggy devices do so anyway.
492 */
James Bottomley39216032005-06-15 18:48:29 -0500493 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500494 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if ((sshdr.sense_key == UNIT_ATTENTION) &&
496 ((sshdr.asc == 0x28) ||
497 (sshdr.asc == 0x29)) &&
498 (sshdr.ascq == 0))
499 continue;
500 }
501 }
502 break;
503 }
504
James Bottomley39216032005-06-15 18:48:29 -0500505 if (result == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 response_len = (unsigned char) inq_result[4] + 5;
507 if (response_len > 255)
508 response_len = first_inquiry_len; /* sanity */
509
510 /*
511 * Get any flags for this device.
512 *
513 * XXX add a bflags to Scsi_Device, and replace the
514 * corresponding bit fields in Scsi_Device, so bflags
515 * need not be passed as an argument.
516 */
517 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
518 &inq_result[16]);
519
520 /* When the first pass succeeds we gain information about
521 * what larger transfer lengths might work. */
522 if (pass == 1) {
523 if (BLIST_INQUIRY_36 & *bflags)
524 next_inquiry_len = 36;
525 else if (BLIST_INQUIRY_58 & *bflags)
526 next_inquiry_len = 58;
527 else if (sdev->inquiry_len)
528 next_inquiry_len = sdev->inquiry_len;
529 else
530 next_inquiry_len = response_len;
531
532 /* If more data is available perform the second pass */
533 if (next_inquiry_len > try_inquiry_len) {
534 try_inquiry_len = next_inquiry_len;
535 pass = 2;
536 goto next_pass;
537 }
538 }
539
540 } else if (pass == 2) {
541 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
542 "Consider BLIST_INQUIRY_36 for this device\n",
543 try_inquiry_len);
544
545 /* If this pass failed, the third pass goes back and transfers
546 * the same amount as we successfully got in the first pass. */
547 try_inquiry_len = first_inquiry_len;
548 pass = 3;
549 goto next_pass;
550 }
551
552 /* If the last transfer attempt got an error, assume the
553 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500554 if (result)
555 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 /* Don't report any more data than the device says is valid */
558 sdev->inquiry_len = min(try_inquiry_len, response_len);
559
560 /*
561 * XXX Abort if the response length is less than 36? If less than
562 * 32, the lookup of the device flags (above) could be invalid,
563 * and it would be possible to take an incorrect action - we do
564 * not want to hang because of a short INQUIRY. On the flip side,
565 * if the device is spun down or becoming ready (and so it gives a
566 * short INQUIRY), an abort here prevents any further use of the
567 * device, including spin up.
568 *
569 * Related to the above issue:
570 *
571 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
572 * and if not ready, sent a START_STOP to start (maybe spin up) and
573 * then send the INQUIRY again, since the INQUIRY can change after
574 * a device is initialized.
575 *
576 * Ideally, start a device if explicitly asked to do so. This
577 * assumes that a device is spun up on power on, spun down on
578 * request, and then spun up on request.
579 */
580
581 /*
582 * The scanning code needs to know the scsi_level, even if no
583 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
584 * non-zero LUNs can be scanned.
585 */
586 sdev->scsi_level = inq_result[2] & 0x07;
587 if (sdev->scsi_level >= 2 ||
588 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
589 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500590 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
James Bottomley39216032005-06-15 18:48:29 -0500592 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}
594
595/**
596 * scsi_add_lun - allocate and fully initialze a Scsi_Device
597 * @sdevscan: holds information to be stored in the new Scsi_Device
598 * @sdevnew: store the address of the newly allocated Scsi_Device
599 * @inq_result: holds the result of a previous INQUIRY to the LUN
600 * @bflags: black/white list flag
601 *
602 * Description:
603 * Allocate and initialize a Scsi_Device matching sdevscan. Optionally
604 * set fields based on values in *@bflags. If @sdevnew is not
605 * NULL, store the address of the new Scsi_Device in *@sdevnew (needed
606 * when scanning a particular LUN).
607 *
608 * Return:
609 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
610 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
611 **/
612static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
613{
614 /*
615 * XXX do not save the inquiry, since it can change underneath us,
616 * save just vendor/model/rev.
617 *
618 * Rather than save it and have an ioctl that retrieves the saved
619 * value, have an ioctl that executes the same INQUIRY code used
620 * in scsi_probe_lun, let user level programs doing INQUIRY
621 * scanning run at their own risk, or supply a user level program
622 * that can correctly scan.
623 */
624 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
625 if (sdev->inquiry == NULL) {
626 return SCSI_SCAN_NO_RESPONSE;
627 }
628
629 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len);
630 sdev->vendor = (char *) (sdev->inquiry + 8);
631 sdev->model = (char *) (sdev->inquiry + 16);
632 sdev->rev = (char *) (sdev->inquiry + 32);
633
634 if (*bflags & BLIST_ISROM) {
635 /*
636 * It would be better to modify sdev->type, and set
637 * sdev->removable, but then the print_inquiry() output
638 * would not show TYPE_ROM; if print_inquiry() is removed
639 * the issue goes away.
640 */
641 inq_result[0] = TYPE_ROM;
642 inq_result[1] |= 0x80; /* removable */
643 } else if (*bflags & BLIST_NO_ULD_ATTACH)
644 sdev->no_uld_attach = 1;
645
646 switch (sdev->type = (inq_result[0] & 0x1f)) {
647 case TYPE_TAPE:
648 case TYPE_DISK:
649 case TYPE_PRINTER:
650 case TYPE_MOD:
651 case TYPE_PROCESSOR:
652 case TYPE_SCANNER:
653 case TYPE_MEDIUM_CHANGER:
654 case TYPE_ENCLOSURE:
655 case TYPE_COMM:
Al Viro 631e8a12005-05-16 01:59:55 +0100656 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 sdev->writeable = 1;
658 break;
659 case TYPE_WORM:
660 case TYPE_ROM:
661 sdev->writeable = 0;
662 break;
663 default:
664 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
665 }
666
667 print_inquiry(inq_result);
668
669 /*
670 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
671 * spec says: The device server is capable of supporting the
672 * specified peripheral device type on this logical unit. However,
673 * the physical device is not currently connected to this logical
674 * unit.
675 *
676 * The above is vague, as it implies that we could treat 001 and
677 * 011 the same. Stay compatible with previous code, and create a
678 * Scsi_Device for a PQ of 1
679 *
680 * Don't set the device offline here; rather let the upper
681 * level drivers eval the PQ to decide whether they should
682 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
683 */
684
685 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
686 sdev->removable = (0x80 & inq_result[1]) >> 7;
687 sdev->lockable = sdev->removable;
688 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
689
690 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
691 inq_result[56] & 0x04))
692 sdev->ppr = 1;
693 if (inq_result[7] & 0x60)
694 sdev->wdtr = 1;
695 if (inq_result[7] & 0x10)
696 sdev->sdtr = 1;
697
698 sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d",
699 sdev->host->host_no, sdev->channel,
700 sdev->id, sdev->lun);
701
702 /*
703 * End driverfs/devfs code.
704 */
705
706 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
707 !(*bflags & BLIST_NOTQ))
708 sdev->tagged_supported = 1;
709 /*
710 * Some devices (Texel CD ROM drives) have handshaking problems
711 * when used with the Seagate controllers. borken is initialized
712 * to 1, and then set it to 0 here.
713 */
714 if ((*bflags & BLIST_BORKEN) == 0)
715 sdev->borken = 0;
716
717 /*
718 * Apparently some really broken devices (contrary to the SCSI
719 * standards) need to be selected without asserting ATN
720 */
721 if (*bflags & BLIST_SELECT_NO_ATN)
722 sdev->select_no_atn = 1;
723
724 /*
725 * Some devices may not want to have a start command automatically
726 * issued when a device is added.
727 */
728 if (*bflags & BLIST_NOSTARTONADD)
729 sdev->no_start_on_add = 1;
730
731 if (*bflags & BLIST_SINGLELUN)
732 sdev->single_lun = 1;
733
734
735 sdev->use_10_for_rw = 1;
736
737 if (*bflags & BLIST_MS_SKIP_PAGE_08)
738 sdev->skip_ms_page_8 = 1;
739
740 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
741 sdev->skip_ms_page_3f = 1;
742
743 if (*bflags & BLIST_USE_10_BYTE_MS)
744 sdev->use_10_for_ms = 1;
745
746 /* set the device running here so that slave configure
747 * may do I/O */
748 scsi_device_set_state(sdev, SDEV_RUNNING);
749
750 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
751 sdev->use_192_bytes_for_3f = 1;
752
753 if (*bflags & BLIST_NOT_LOCKABLE)
754 sdev->lockable = 0;
755
756 if (*bflags & BLIST_RETRY_HWERROR)
757 sdev->retry_hwerror = 1;
758
759 transport_configure_device(&sdev->sdev_gendev);
760
761 if (sdev->host->hostt->slave_configure)
762 sdev->host->hostt->slave_configure(sdev);
763
764 /*
765 * Ok, the device is now all set up, we can
766 * register it and tell the rest of the kernel
767 * about it.
768 */
Alan Sternb24b1032005-07-27 11:43:46 -0700769 if (scsi_sysfs_add_sdev(sdev) != 0)
770 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 return SCSI_SCAN_LUN_PRESENT;
773}
774
James Bottomley6f3a2022005-09-22 20:33:28 -0500775static inline void scsi_destroy_sdev(struct scsi_device *sdev)
776{
777 if (sdev->host->hostt->slave_destroy)
778 sdev->host->hostt->slave_destroy(sdev);
779 transport_destroy_device(&sdev->sdev_gendev);
780 put_device(&sdev->sdev_gendev);
781}
782
783
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784/**
785 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
786 * @starget: pointer to target device structure
787 * @lun: LUN of target device
788 * @sdevscan: probe the LUN corresponding to this Scsi_Device
789 * @sdevnew: store the value of any new Scsi_Device allocated
790 * @bflagsp: store bflags here if not NULL
791 *
792 * Description:
793 * Call scsi_probe_lun, if a LUN with an attached device is found,
794 * allocate and set it up by calling scsi_add_lun.
795 *
796 * Return:
797 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
798 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
799 * attached at the LUN
800 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
801 **/
802static int scsi_probe_and_add_lun(struct scsi_target *starget,
803 uint lun, int *bflagsp,
804 struct scsi_device **sdevp, int rescan,
805 void *hostdata)
806{
807 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500809 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
811
812 /*
813 * The rescan flag is used as an optimization, the first scan of a
814 * host adapter calls into here with rescan == 0.
815 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500816 sdev = scsi_device_lookup_by_target(starget, lun);
817 if (sdev) {
818 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
820 "scsi scan: device exists on %s\n",
821 sdev->sdev_gendev.bus_id));
822 if (sdevp)
823 *sdevp = sdev;
824 else
825 scsi_device_put(sdev);
826
827 if (bflagsp)
828 *bflagsp = scsi_get_device_flags(sdev,
829 sdev->vendor,
830 sdev->model);
831 return SCSI_SCAN_LUN_PRESENT;
832 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500833 scsi_device_put(sdev);
834 } else
835 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if (!sdev)
837 goto out;
James Bottomley39216032005-06-15 18:48:29 -0500838
839 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -0700840 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 if (!result)
James Bottomley39216032005-06-15 18:48:29 -0500842 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
James Bottomley39216032005-06-15 18:48:29 -0500844 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 goto out_free_result;
846
847 /*
848 * result contains valid SCSI INQUIRY data.
849 */
850 if ((result[0] >> 5) == 3) {
851 /*
852 * For a Peripheral qualifier 3 (011b), the SCSI
853 * spec says: The device server is not capable of
854 * supporting a physical device on this logical
855 * unit.
856 *
857 * For disks, this implies that there is no
858 * logical disk configured at sdev->lun, but there
859 * is a target id responding.
860 */
861 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
862 "scsi scan: peripheral qualifier of 3,"
863 " no device added\n"));
864 res = SCSI_SCAN_TARGET_PRESENT;
865 goto out_free_result;
866 }
867
868 res = scsi_add_lun(sdev, result, &bflags);
869 if (res == SCSI_SCAN_LUN_PRESENT) {
870 if (bflags & BLIST_KEY) {
871 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -0500872 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 }
874 if (bflagsp)
875 *bflagsp = bflags;
876 }
877
878 out_free_result:
879 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 out_free_sdev:
881 if (res == SCSI_SCAN_LUN_PRESENT) {
882 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -0400883 if (scsi_device_get(sdev) == 0) {
884 *sdevp = sdev;
885 } else {
886 __scsi_remove_device(sdev);
887 res = SCSI_SCAN_NO_RESPONSE;
888 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500890 } else
891 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 out:
893 return res;
894}
895
896/**
897 * scsi_sequential_lun_scan - sequentially scan a SCSI target
898 * @starget: pointer to target structure to scan
899 * @bflags: black/white list flag for LUN 0
900 * @lun0_res: result of scanning LUN 0
901 *
902 * Description:
903 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
904 * scanned) to some maximum lun until a LUN is found with no device
905 * attached. Use the bflags to figure out any oddities.
906 *
907 * Modifies sdevscan->lun.
908 **/
909static void scsi_sequential_lun_scan(struct scsi_target *starget,
910 int bflags, int lun0_res, int scsi_level,
911 int rescan)
912{
913 unsigned int sparse_lun, lun, max_dev_lun;
914 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
915
916 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
917 "%s\n", starget->dev.bus_id));
918
919 max_dev_lun = min(max_scsi_luns, shost->max_lun);
920 /*
921 * If this device is known to support sparse multiple units,
922 * override the other settings, and scan all of them. Normally,
923 * SCSI-3 devices should be scanned via the REPORT LUNS.
924 */
925 if (bflags & BLIST_SPARSELUN) {
926 max_dev_lun = shost->max_lun;
927 sparse_lun = 1;
928 } else
929 sparse_lun = 0;
930
931 /*
932 * If not sparse lun and no device attached at LUN 0 do not scan
933 * any further.
934 */
935 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT))
936 return;
937
938 /*
939 * If less than SCSI_1_CSS, and no special lun scaning, stop
940 * scanning; this matches 2.4 behaviour, but could just be a bug
941 * (to continue scanning a SCSI_1_CSS device).
942 *
943 * This test is broken. We might not have any device on lun0 for
944 * a sparselun device, and if that's the case then how would we
945 * know the real scsi_level, eh? It might make sense to just not
946 * scan any SCSI_1 device for non-0 luns, but that check would best
947 * go into scsi_alloc_sdev() and just have it return null when asked
948 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
949 *
950 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
951 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
952 == 0))
953 return;
954 */
955 /*
956 * If this device is known to support multiple units, override
957 * the other settings, and scan all of them.
958 */
959 if (bflags & BLIST_FORCELUN)
960 max_dev_lun = shost->max_lun;
961 /*
962 * REGAL CDC-4X: avoid hang after LUN 4
963 */
964 if (bflags & BLIST_MAX5LUN)
965 max_dev_lun = min(5U, max_dev_lun);
966 /*
967 * Do not scan SCSI-2 or lower device past LUN 7, unless
968 * BLIST_LARGELUN.
969 */
970 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
971 max_dev_lun = min(8U, max_dev_lun);
972
973 /*
974 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
975 * until we reach the max, or no LUN is found and we are not
976 * sparse_lun.
977 */
978 for (lun = 1; lun < max_dev_lun; ++lun)
979 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
980 NULL) != SCSI_SCAN_LUN_PRESENT) &&
981 !sparse_lun)
982 return;
983}
984
985/**
986 * scsilun_to_int: convert a scsi_lun to an int
987 * @scsilun: struct scsi_lun to be converted.
988 *
989 * Description:
990 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
991 * integer, and return the result. The caller must check for
992 * truncation before using this function.
993 *
994 * Notes:
995 * The struct scsi_lun is assumed to be four levels, with each level
996 * effectively containing a SCSI byte-ordered (big endian) short; the
997 * addressing bits of each level are ignored (the highest two bits).
998 * For a description of the LUN format, post SCSI-3 see the SCSI
999 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1000 *
1001 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1002 * the integer: 0x0b030a04
1003 **/
1004static int scsilun_to_int(struct scsi_lun *scsilun)
1005{
1006 int i;
1007 unsigned int lun;
1008
1009 lun = 0;
1010 for (i = 0; i < sizeof(lun); i += 2)
1011 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1012 scsilun->scsi_lun[i + 1]) << (i * 8));
1013 return lun;
1014}
1015
1016/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001017 * int_to_scsilun: reverts an int into a scsi_lun
1018 * @int: integer to be reverted
1019 * @scsilun: struct scsi_lun to be set.
1020 *
1021 * Description:
1022 * Reverts the functionality of the scsilun_to_int, which packed
1023 * an 8-byte lun value into an int. This routine unpacks the int
1024 * back into the lun value.
1025 * Note: the scsilun_to_int() routine does not truly handle all
1026 * 8bytes of the lun value. This functions restores only as much
1027 * as was set by the routine.
1028 *
1029 * Notes:
1030 * Given an integer : 0x0b030a04, this function returns a
1031 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1032 *
1033 **/
1034void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1035{
1036 int i;
1037
1038 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1039
1040 for (i = 0; i < sizeof(lun); i += 2) {
1041 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1042 scsilun->scsi_lun[i+1] = lun & 0xFF;
1043 lun = lun >> 16;
1044 }
1045}
1046EXPORT_SYMBOL(int_to_scsilun);
1047
1048/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1050 * @sdevscan: scan the host, channel, and id of this Scsi_Device
1051 *
1052 * Description:
1053 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1054 * command, and scan the resulting list of LUNs by calling
1055 * scsi_probe_and_add_lun.
1056 *
1057 * Modifies sdevscan->lun.
1058 *
1059 * Return:
1060 * 0: scan completed (or no memory, so further scanning is futile)
1061 * 1: no report lun scan, or not configured
1062 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001063static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 int rescan)
1065{
1066 char devname[64];
1067 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1068 unsigned int length;
1069 unsigned int lun;
1070 unsigned int num_luns;
1071 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001072 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 u8 *data;
1075 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001076 struct scsi_device *sdev;
1077 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 /*
1080 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1081 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1082 * support more than 8 LUNs.
1083 */
1084 if ((bflags & BLIST_NOREPORTLUN) ||
James Bottomley6f3a2022005-09-22 20:33:28 -05001085 starget->scsi_level < SCSI_2 ||
1086 (starget->scsi_level < SCSI_3 &&
1087 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 return 1;
1089 if (bflags & BLIST_NOLUN)
1090 return 0;
1091
James Bottomley6f3a2022005-09-22 20:33:28 -05001092 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1093 sdev = scsi_alloc_sdev(starget, 0, NULL);
1094 if (!sdev)
1095 return 0;
1096 if (scsi_device_get(sdev))
1097 return 0;
1098 }
1099
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001101 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 /*
1104 * Allocate enough to hold the header (the same size as one scsi_lun)
1105 * plus the max number of luns we are requesting.
1106 *
1107 * Reallocating and trying again (with the exact amount we need)
1108 * would be nice, but then we need to somehow limit the size
1109 * allocated based on the available memory and the limits of
1110 * kmalloc - we don't want a kmalloc() failure of a huge value to
1111 * prevent us from finding any LUNs on this target.
1112 */
1113 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1114 lun_data = kmalloc(length, GFP_ATOMIC |
1115 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001116 if (!lun_data) {
1117 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
James Bottomley39216032005-06-15 18:48:29 -05001118 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120
1121 scsi_cmd[0] = REPORT_LUNS;
1122
1123 /*
1124 * bytes 1 - 5: reserved, set to zero.
1125 */
1126 memset(&scsi_cmd[1], 0, 5);
1127
1128 /*
1129 * bytes 6 - 9: length of the command.
1130 */
1131 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1132 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1133 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1134 scsi_cmd[9] = (unsigned char) length & 0xff;
1135
1136 scsi_cmd[10] = 0; /* reserved */
1137 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138
1139 /*
1140 * We can get a UNIT ATTENTION, for example a power on/reset, so
1141 * retry a few times (like sd.c does for TEST UNIT READY).
1142 * Experience shows some combinations of adapter/devices get at
1143 * least two power on/resets.
1144 *
1145 * Illegal requests (for devices that do not support REPORT LUNS)
1146 * should come through as a check condition, and will not generate
1147 * a retry.
1148 */
1149 for (retries = 0; retries < 3; retries++) {
1150 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1151 " REPORT LUNS to %s (try %d)\n", devname,
1152 retries));
James Bottomley39216032005-06-15 18:48:29 -05001153
James Bottomley39216032005-06-15 18:48:29 -05001154 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001155 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001156 SCSI_TIMEOUT + 4 * HZ, 3);
1157
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001159 " %s (try %d) result 0x%x\n", result
1160 ? "failed" : "successful", retries, result));
1161 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001163 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 if (sshdr.sense_key != UNIT_ATTENTION)
1165 break;
1166 }
1167 }
1168
James Bottomley39216032005-06-15 18:48:29 -05001169 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 /*
1171 * The device probably does not support a REPORT LUN command
1172 */
1173 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 return 1;
1175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177 /*
1178 * Get the length from the first four bytes of lun_data.
1179 */
1180 data = (u8 *) lun_data->scsi_lun;
1181 length = ((data[0] << 24) | (data[1] << 16) |
1182 (data[2] << 8) | (data[3] << 0));
1183
1184 num_luns = (length / sizeof(struct scsi_lun));
1185 if (num_luns > max_scsi_report_luns) {
1186 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1187 " of %d luns reported, try increasing"
1188 " max_scsi_report_luns.\n", devname,
1189 max_scsi_report_luns, num_luns);
1190 num_luns = max_scsi_report_luns;
1191 }
1192
1193 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUN scan of"
1194 " host %d channel %d id %d\n", sdev->host->host_no,
1195 sdev->channel, sdev->id));
1196
1197 /*
1198 * Scan the luns in lun_data. The entry at offset 0 is really
1199 * the header, so start at 1 and go up to and including num_luns.
1200 */
1201 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1202 lun = scsilun_to_int(lunp);
1203
1204 /*
1205 * Check if the unused part of lunp is non-zero, and so
1206 * does not fit in lun.
1207 */
1208 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1209 int i;
1210
1211 /*
1212 * Output an error displaying the LUN in byte order,
1213 * this differs from what linux would print for the
1214 * integer LUN value.
1215 */
1216 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1217 data = (char *)lunp->scsi_lun;
1218 for (i = 0; i < sizeof(struct scsi_lun); i++)
1219 printk("%02x", data[i]);
1220 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 } else if (lun > sdev->host->max_lun) {
1222 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1223 " than allowed by the host adapter\n",
1224 devname, lun);
1225 } else {
1226 int res;
1227
1228 res = scsi_probe_and_add_lun(starget,
1229 lun, NULL, NULL, rescan, NULL);
1230 if (res == SCSI_SCAN_NO_RESPONSE) {
1231 /*
1232 * Got some results, but now none, abort.
1233 */
1234 printk(KERN_ERR "scsi: Unexpected response"
1235 " from %s lun %d while scanning, scan"
1236 " aborted\n", devname, lun);
1237 break;
1238 }
1239 }
1240 }
1241
1242 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001244 scsi_device_put(sdev);
1245 if (sdev->sdev_state == SDEV_CREATED)
1246 /*
1247 * the sdev we used didn't appear in the report luns scan
1248 */
1249 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 return 0;
1251}
1252
1253struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1254 uint id, uint lun, void *hostdata)
1255{
1256 struct scsi_device *sdev;
1257 struct device *parent = &shost->shost_gendev;
1258 int res;
1259 struct scsi_target *starget = scsi_alloc_target(parent, channel, id);
1260
1261 if (!starget)
1262 return ERR_PTR(-ENOMEM);
1263
Nathan Lynchc92715b2005-06-02 17:15:09 -05001264 get_device(&starget->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 down(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001266 if (scsi_host_scan_allowed(shost)) {
1267 res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
1268 hostdata);
1269 if (res != SCSI_SCAN_LUN_PRESENT)
1270 sdev = ERR_PTR(-ENODEV);
1271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 up(&shost->scan_mutex);
1273 scsi_target_reap(starget);
1274 put_device(&starget->dev);
1275
1276 return sdev;
1277}
1278EXPORT_SYMBOL(__scsi_add_device);
1279
James Bottomley146f7262005-09-10 12:44:09 -05001280int scsi_add_device(struct Scsi_Host *host, uint channel,
1281 uint target, uint lun)
1282{
1283 struct scsi_device *sdev =
1284 __scsi_add_device(host, channel, target, lun, NULL);
1285 if (IS_ERR(sdev))
1286 return PTR_ERR(sdev);
1287
1288 scsi_device_put(sdev);
1289 return 0;
1290}
1291EXPORT_SYMBOL(scsi_add_device);
1292
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293void scsi_rescan_device(struct device *dev)
1294{
1295 struct scsi_driver *drv;
1296
1297 if (!dev->driver)
1298 return;
1299
1300 drv = to_scsi_driver(dev->driver);
1301 if (try_module_get(drv->owner)) {
1302 if (drv->rescan)
1303 drv->rescan(dev);
1304 module_put(drv->owner);
1305 }
1306}
1307EXPORT_SYMBOL(scsi_rescan_device);
1308
Alan Sterne517d312005-07-26 10:18:45 -04001309static void __scsi_scan_target(struct device *parent, unsigned int channel,
1310 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311{
1312 struct Scsi_Host *shost = dev_to_shost(parent);
1313 int bflags = 0;
1314 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 struct scsi_target *starget;
1316
1317 if (shost->this_id == id)
1318 /*
1319 * Don't scan the host adapter
1320 */
1321 return;
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 if (!starget)
1325 return;
1326
1327 get_device(&starget->dev);
1328 if (lun != SCAN_WILD_CARD) {
1329 /*
1330 * Scan for a specific host/chan/id/lun.
1331 */
1332 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1333 goto out_reap;
1334 }
1335
1336 /*
1337 * Scan LUN 0, if there is some response, scan further. Ideally, we
1338 * would not configure LUN 0 until all LUNs are scanned.
1339 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001340 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1341 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1342 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 /*
1344 * The REPORT LUN did not scan the target,
1345 * do a sequential scan.
1346 */
1347 scsi_sequential_lun_scan(starget, bflags,
James Bottomley6f3a2022005-09-22 20:33:28 -05001348 res, starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
1351 out_reap:
1352 /* now determine if the target has any children at all
1353 * and if not, nuke it */
1354 scsi_target_reap(starget);
1355
1356 put_device(&starget->dev);
1357}
Alan Sterne517d312005-07-26 10:18:45 -04001358
1359/**
1360 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1361 * target.
1362 * @parent: host to scan
1363 * @channel: channel to scan
1364 * @id: target id to scan
1365 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1366 * @rescan: passed to LUN scanning routines
1367 *
1368 * Description:
1369 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1370 * and possibly all LUNs on the target id.
1371 *
1372 * First try a REPORT LUN scan, if that does not scan the target, do a
1373 * sequential scan of LUNs on the target id.
1374 **/
1375void scsi_scan_target(struct device *parent, unsigned int channel,
1376 unsigned int id, unsigned int lun, int rescan)
1377{
1378 struct Scsi_Host *shost = dev_to_shost(parent);
1379
1380 down(&shost->scan_mutex);
1381 if (scsi_host_scan_allowed(shost))
1382 __scsi_scan_target(parent, channel, id, lun, rescan);
1383 up(&shost->scan_mutex);
1384}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385EXPORT_SYMBOL(scsi_scan_target);
1386
1387static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1388 unsigned int id, unsigned int lun, int rescan)
1389{
1390 uint order_id;
1391
1392 if (id == SCAN_WILD_CARD)
1393 for (id = 0; id < shost->max_id; ++id) {
1394 /*
1395 * XXX adapter drivers when possible (FCP, iSCSI)
1396 * could modify max_id to match the current max,
1397 * not the absolute max.
1398 *
1399 * XXX add a shost id iterator, so for example,
1400 * the FC ID can be the same as a target id
1401 * without a huge overhead of sparse id's.
1402 */
1403 if (shost->reverse_ordering)
1404 /*
1405 * Scan from high to low id.
1406 */
1407 order_id = shost->max_id - id - 1;
1408 else
1409 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001410 __scsi_scan_target(&shost->shost_gendev, channel,
1411 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 }
1413 else
Alan Sterne517d312005-07-26 10:18:45 -04001414 __scsi_scan_target(&shost->shost_gendev, channel,
1415 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416}
1417
1418int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1419 unsigned int id, unsigned int lun, int rescan)
1420{
1421 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "%s: <%u:%u:%u:%u>\n",
1422 __FUNCTION__, shost->host_no, channel, id, lun));
1423
1424 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1425 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) ||
1426 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1427 return -EINVAL;
1428
1429 down(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001430 if (scsi_host_scan_allowed(shost)) {
1431 if (channel == SCAN_WILD_CARD)
1432 for (channel = 0; channel <= shost->max_channel;
1433 channel++)
1434 scsi_scan_channel(shost, channel, id, lun,
1435 rescan);
1436 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 up(&shost->scan_mutex);
1440
1441 return 0;
1442}
1443
1444/**
1445 * scsi_scan_host - scan the given adapter
1446 * @shost: adapter to scan
1447 **/
1448void scsi_scan_host(struct Scsi_Host *shost)
1449{
1450 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1451 SCAN_WILD_CARD, 0);
1452}
1453EXPORT_SYMBOL(scsi_scan_host);
1454
1455/**
1456 * scsi_scan_single_target - scan the given SCSI target
1457 * @shost: adapter to scan
1458 * @chan: channel to scan
1459 * @id: target id to scan
1460 **/
1461void scsi_scan_single_target(struct Scsi_Host *shost,
1462 unsigned int chan, unsigned int id)
1463{
1464 scsi_scan_host_selected(shost, chan, id, SCAN_WILD_CARD, 1);
1465}
1466EXPORT_SYMBOL(scsi_scan_single_target);
1467
1468void scsi_forget_host(struct Scsi_Host *shost)
1469{
Alan Sterna64358d2005-07-26 10:27:10 -04001470 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 unsigned long flags;
1472
Alan Sterna64358d2005-07-26 10:27:10 -04001473 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001475 list_for_each_entry(sdev, &shost->__devices, siblings) {
1476 if (sdev->sdev_state == SDEV_DEL)
1477 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001479 __scsi_remove_device(sdev);
1480 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 }
1482 spin_unlock_irqrestore(shost->host_lock, flags);
1483}
1484
1485/*
1486 * Function: scsi_get_host_dev()
1487 *
1488 * Purpose: Create a Scsi_Device that points to the host adapter itself.
1489 *
1490 * Arguments: SHpnt - Host that needs a Scsi_Device
1491 *
1492 * Lock status: None assumed.
1493 *
1494 * Returns: The Scsi_Device or NULL
1495 *
1496 * Notes:
1497 * Attach a single Scsi_Device to the Scsi_Host - this should
1498 * be made to look like a "pseudo-device" that points to the
1499 * HA itself.
1500 *
1501 * Note - this device is not accessible from any high-level
1502 * drivers (including generics), which is probably not
1503 * optimal. We can add hooks later to attach
1504 */
1505struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1506{
Alan Sterne517d312005-07-26 10:18:45 -04001507 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 struct scsi_target *starget;
1509
Alan Sterne517d312005-07-26 10:18:45 -04001510 down(&shost->scan_mutex);
1511 if (!scsi_host_scan_allowed(shost))
1512 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1514 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001515 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
1517 sdev = scsi_alloc_sdev(starget, 0, NULL);
1518 if (sdev) {
1519 sdev->sdev_gendev.parent = get_device(&starget->dev);
1520 sdev->borken = 0;
1521 }
1522 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001523 out:
1524 up(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 return sdev;
1526}
1527EXPORT_SYMBOL(scsi_get_host_dev);
1528
1529/*
1530 * Function: scsi_free_host_dev()
1531 *
1532 * Purpose: Free a scsi_device that points to the host adapter itself.
1533 *
1534 * Arguments: SHpnt - Host that needs a Scsi_Device
1535 *
1536 * Lock status: None assumed.
1537 *
1538 * Returns: Nothing
1539 *
1540 * Notes:
1541 */
1542void scsi_free_host_dev(struct scsi_device *sdev)
1543{
1544 BUG_ON(sdev->id != sdev->host->this_id);
1545
James Bottomley6f3a2022005-09-22 20:33:28 -05001546 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547}
1548EXPORT_SYMBOL(scsi_free_host_dev);
1549